Thank you for looking into this issue, please find enclosed sample projects for 15.2 and 13.1. We are able to see the difference between the two versions. In our application, it's worse.

Thanks,

Crystal.

Hi Miteva,  can you try to drag the scroll bar fast from top to the middle then back and forth a few times? We can see there are differences between the two versions. 13.1 one is more responsive. Can you check the code to see if there is any changes in the area?

15.2 version is 15.2.20152.2052, runtime version v4.0.30319

13.1 version is 13.1.20131.2060, runtime version v4.0.30319

I tested on Windows 10.

Thanks,
Crystal.

Hello Crystal,    

        
I made a simple test of both samples you provided using the versions, you are using (13.1.20131.2060 and 15.2.20152.2052). The test measures the time for scrolling the grid from the top to the middle and then scrolling back to the top and down again. Attached is a video file of the performed test.

As you will see from the attached file, I still cannot reproduce the issue you describe, so it will help if you could record a video that demonstrates the behavior you are seeing.

Please find enclosed recording that shows the performance difference.

Thanks,

Crystal.

Hello Crystal,

            
I do not see any performance difference between the two samples when scrolling down the grid. There have not been made any changes regarding the scrolling in the grid between 13.1 and 15.2 versions that should cause performance issue. In order to make more visible the row change when scrolling I have changed the images in the sample projects so that every row will have a different picture embedded in it. Attached is also a video record of the test with the new samples.

Hi,

I work with Crystal (OP) at the same company. We have had more clients reporting the performance issue while scrolling the grid. I have more details to add to this case.

The issue is indeed with the FormattedTextEditor and is specific to when the formatted text contains icons. In our application, there is an option to turn on/off the presence of icons in the FormattedTextEditor column. When the column does not have any icons being rendered, there is a bit of noticeable lag while scrolling. When the column does have icons being rendered, there is a great amount of lag while scrolling. My test data only has about 400 rows of data, nowhere near the 1000 that Crystal original suggested.

When Crystal originally opened this case, our application was using Infragistics Professional 2015 Volume 2 (as indicated by the dll versions mentioned above in the notes from Crystal). This is also the version that our current clients are using where they are reporting this lag.

Since the release of our application which uses Infragistics Professional 2015 Volume 2 we have since upgraded our next release to use Infragistics Professional 2017 Volume 1. In this newer release, we do not see any lag at all during scrolling of the grid, with or without icons present in the column. I am using the exact same data for the older release as I am for the new release.

As a test, I updated the dependencies in our previous release from Infragistics Professional 2015 Volume 2 to now use Infragistics Professional 2017 Volume 1. I did not see any lag while scrolling. Although this worked in my test environment, this is not a viable option for us to update our older release of the application to use the newer Infragistics assemblies. This would be a major regression of the application both for us and our clients.

There is clearly a difference between the performance of Infragistics Professional 2015 Volume 2 and Infragistics Professional 2017 Volume 1 in regards to scrolling in the grid when there are icons present.

Are there any patches available that address this performance issue? If not, can you please provide a patch. This is becoming a major issue for our clients. We would really appreciate any help that you can provide.

Thanks,

Lindos.

The value of the field in the DataRow is being set when we update the UltraDataSource for the grid. This happens as we navigate from one business object to the next (the grid data is refreshed for each business object by first clearing the rows collection in the UltraDataSource). The code spins through a collection (the row data) in the business object and calls the UltraDataSource objects Rows.Add() method for each new row. Each new DataRow's column values are then updated. After all the data has been loaded we don't update it any further. From this point on (until the next business object is loaded) the data remains static.

In what event are you setting the value of the field in the DataRow. I assume that's done before you bind to the grid. Or are you dynamically building or changing the data as you scroll, like in the InitializeRow event of the grid or something?

Okay, that makes sense. Not sure why I was confused - it seems perfectly obvious from the code, now. 

Hi Mike,

Clarifying what ImageX is.

In the Visual Studio project, a Resource file (Resources.resx) is added to the project under the Properties folder. Opening up the Resource file in Visual Studio you can select the Images section from the dropdown. The Images are added to this section by drag and drop from Windows Explorer where the image filename becomes the key in the Resource file. The Resource file has a build action of Embedded Resource.

The embedded images are referenced from the Resource file in code using the following:

var image = Properties.Resources.ImageX;

Where ImageX is the name of the image in the resource file.

We did discuss keeping the images as is, embedded in a resource file, and writing them to disk at the time they were needed. This option was ultimately rejected due to business needs and the decision to deploy the images up front in a folder was made.

If I can reproduce the issue in a sample project I will definitely send it your way.

Thanks for your help.

Lindos.